Particle Size Effect of the Alq3 Target Source on OLED Efficiency

• Main Authors: Yu-Cheng Hsieh, 謝宥晟
• Other Authors: 李度
• Format: Others
• Language: en_US
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/84u5x9

碩士 === 國立中央大學 === 化學工程與材料工程學系 === 101 === The relationship between the particle size of the target source and the photoelectric characteristic of organic light-emitting diode (OLED) was investigated in this thesis. The insonated Alq3 particulates were smaller than the as-received Alq3 particulates. The insonated Alq3 particulates were compacted with a better connectivity which related to heat conduction. With better heat conduction, the Alq3 vapor was deposited on a substrate with a kinetically driven growth mechanism. Smaller crystallites were resulted in the thin film which gave a highly electronic transportation, leading to an increased current density. Because of the given thickness and the drop of the electronic blocking ability, the recombination probability of carriers by the smaller crystallite size in the thin film could not be enhanced. The insonated Alq3 produced device exhibited, at 10000 cd/m2, for example, the current density of 0.23 A/cm2 and the current efficiency of 4.55 cd/A, whereas the as-received Alq3 produced device displayed 0.09 A/cm2 and 5.57 cd/A, respectively. This suggested that the target source with compacted connection accompanied the improvement of the electronic transmission and the reproducibility of OLEDs for thermal evaporation process.